Aluminium oxide is impermeable and, unlike the oxide layers on many other metals, it adheres strongly to the parent metal. If damaged mechanically, aluminiumâs oxide layer repairs itself immediately.
Saliva helps remove oral waste and cavity-causing bacteria, protects teeth from decay by neutralizing harmful acids, and helps re-mineralize tooth enamel. Saliva also keeps oral tissues healthy by preventing infection by controlling bacteria and fungi in the mouth.
Saliva helps moisten food and also starts the digestive process. Saliva is produced by the salivary glands. The Colorado State Pathophysiology Department notes that most animals (including humans) have three different pairs of salivary glands.The parotid glands are located in the cheeks.aliva helps moisten food and also starts the digestive process. Saliva is produced by the salivary glands. The Colorado State Pathophysiology Department notes that most animals (including humans) have three different pairs of salivary glands.